Initial commit: Invoice field extraction system using YOLO + OCR

Features:
- Auto-labeling pipeline: CSV values -> PDF search -> YOLO annotations
- Flexible date matching: year-month match, nearby date tolerance
- PDF text extraction with PyMuPDF
- OCR support for scanned documents (PaddleOCR)
- YOLO training and inference pipeline
- 7 field types: InvoiceNumber, InvoiceDate, InvoiceDueDate, OCR, Bankgiro, Plusgiro, Amount

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.gitignore

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+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+
+# Virtual environments
+venv/
+ENV/
+env/
+.venv/
+
+# IDE
+.idea/
+.vscode/
+*.swp
+*.swo
+*~
+
+# Data files (large files)
+data/raw_pdfs/
+data/dataset/train/images/
+data/dataset/val/images/
+data/dataset/test/images/
+data/dataset/train/labels/
+data/dataset/val/labels/
+data/dataset/test/labels/
+*.pdf
+*.png
+*.jpg
+*.jpeg
+
+# Model weights
+models/weights/
+runs/
+*.pt
+*.onnx
+
+# Reports and logs
+reports/*.jsonl
+logs/
+*.log
+
+# Jupyter
+.ipynb_checkpoints/
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Credentials
+.env
+*.key
+*.pem
+credentials.json